# Flex function in user written model

Hi,

I was looking at the flex source code of model OLTC1 and there are many functions which I can't find the definition. Example: -CALL CNTVLT(MIN(II,JJ),INTICN(I+2),VM) -(PQCONT(IT) -CALL DELAY(I+3,J+1,N+1) -CALL FNDKF1(II,JJ,ICKT,KF)

Where can I find the definition of these functions?

Thanks